Tire symbols don't understand you don't say you understand cars

Tire symbols don't understand you don't say you understand the car !!!

First of all, let's take a look at the parameter distribution of car tires as a whole

The main function of the tire

Simply put, it is two points, bearing and damping

Introduction to the basic parameters of the tire

Section width

Note that it is the width of the tread that the tire is in contact with the ground, so you need to distinguish between the width of the section and the width of the crown.

Flat ratio

The flat ratio is the ratio of the height of the section to the width of the section. The simple summary is that the smaller the value, the thinner the tread, the stronger the feedback on the road surface, but the comfort is reduced; the larger the value, the thicker the tread, the worse the road sense, but the better the comfort, and the weaker the lateral resistance to the turn.

Hub diameter

Wheel diameter, this does not need to be said more.

Load factor

The load factor represents the weight that the tire can bear, and the editor is nagging a sentence, do not overload when driving safely. For example, the tire load system 91 in the figure above, according to the table, for the load factor of more than 600 KG, four wheels multiplied by four, we can get the load of the car is about 2.4 tons.

(Partial, but not all)

Speed level

Tires are mainly composed of polymer composites, and rising temperatures will accelerate rubber aging. When the car is running at high speed, it will increase the temperature of the entire tire, resulting in increased tread wear, the tire has its design critical speed, when the high-speed driving reaches this speed, the tire will appear "standing wave" phenomenon, which is the "critical speed" of the tire, if it continues to be used under this condition, the tire will have the risk of bursting. So drive safely and don't overpeed. For example, the speed level W in the figure above, compared with the table, the speed is 270km/h.

standing wave

The above mentioned standing wave, let's talk about what is standing wave, a picture to tell you.

Advanced parameter analysis

Three "T" indexes - tire quality labels

Many netizens and car owners are not very familiar with the three indices of tire Tapewear / Traction / Temperature, or do not understand it in depth, so that it is easy to be ambiguous and misunderstanding when choosing tires of various brands, so we specially take you to see what the meaning of the three "T" indexes is.

Certification information / Tire Origin / Factory Code / Date Generated

Here Xiaobian in a nagging sentence, the production date of more than 6 years tires are recommended not to use, once the tires reach this time period, the quality plummets!

AT refers to off-road tires suitable for all road conditions, MT refers to off-road tires suitable for professional off-road surfaces, and HT refers to off-road tires suitable for urban road surfaces.

Tire wear marking

Off-road tire type

If you're a car lover, then you should also love off-roading. What about the types of off-road tires? AT refers to off-road tires suitable for all road conditions, MT refers to off-road tires suitable for professional off-road surfaces, and HT refers to off-road tires suitable for urban road surfaces.

Other identification marks for tires

Tire modification

After introducing the basics of tires, it is time to enter the modification tutorial

What is a J-value?

Many car owners will also upgrade the wheel hub at the same time as upgrading the tire, and here involves another value corresponding to the tire width value, the wheel hub J value. The J value of the tire is the width of the hub.

The J value of the hub has a corresponding table, for example, the figure above says 16x61/2J (16x6.5J), the comparison table, the width of the hub selection range (195-215), choose 205 is appropriate!

Calculate the wheel speed difference

Different tire widths, flat ratios, wheel radius, corresponding tire diameters are different, angular velocity is the same, tire travel speed and dashboard display numbers will produce deviations!

At this point, we can use a small tool "Tire Calculator". Baidu Tire Calculator, enter the front and rear tire width, flat ratio, wheel radius, calculate the error value before and after the replacement.

For example, if we replace the 195 65 R15 tire with a 215 55 R17 tire, the speedometer will show 98.098 km/h at the actual speed limit of 100 km/h, and your speed will be slightly slower in the speed limit section